MB_WARN_ONCE
MB_WARN_ONCE(mb_chann, "Invalid tail 0x%x", tail);
MB_WARN_ONCE(mb_chann, "Tombstone, head 0x%x tail 0x%x",
MB_WARN_ONCE(mb_chann, "Invalid total size 0x%x", header.total_size);
MB_WARN_ONCE(mb_chann, "Invalid message size %d, tail %d, head %d",